Electrical condenser



Feb. 16, 1932. 1 D N 1,845,138

ELECTRICAL CONDENSER Original Filed Jan. 12', 1926 Patented Feb. 16, 1932 UNITED STATES PATENT OFFICE LUDWIG EDENBURG, OF NEW YORK, N. Y., ASSIGNOR TO DUBILIER CONDENSER COR- PORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE ELECTRICAL CONDENSER Application filed January 12, 1926,.Seria1 No..80,746. Renewed July 6, 1931.

This invention relates to an improved electrical condenser; and has, for one of its objects to provide a condenser of fixed capacity, simple but strongin construction, and adapted to withstand handling, and usage, and to afford extended and efiicient service.

Another object of the invention is to provide a condenser in which the electrically conductive elements or metallic sheets and intervening insulation can be compressed and kept in firm and uniform contact, over their entire area, and in a very advantageous manner.

The nature and objects of my invention will fully appear from the following description, taken with the drawings, and the novel characteristics of my invention will be defined in the appended claims. But the disclosure is for pnrposes'of example only, and I may make any changes in the shape, size and arrangement of the various arts that are embraced within the scope of t e broad terms in which the claims are expressed.

On the drawings,

Figure 1 is a perspective view of the various parts of a condenser accordinglto my invention, in position to-be assemble Figure 2 is a top plan of such a condenser when finished;

Figure 3 is an end view; and Figure 4 a longitudinal section through same; and

Figures 5 and 6 are perspective views of some of the parts.

The same numerals identify the same parts throughout.

The numeral 1 indicates a base or mounting member which is preferably of metal but can be of any other suitable material. It has substantially the form .of a cylindrical segment being fiat on one face and convex on the other. In the convex face is a longitudinal groove 2 which receives a thick strip or bar of some insulating material such as phenolic condensation'product 3. The stack of the condenser comprises a number of sheets of mica or other insulation 4 in between elements of electrically conductive material such as sheets of metal foil 5. Part of these metallic sheets of foil project from one end of the stack, and part from the other end, the

sheets of foil projecting from one end alternating with those projecting from the other, as is the usual construction. On the convex face of the member 1, I lay a sheet of mica 6 and over this, a metal plate 7, and between the metal plate 7, and the stack, is another sheet of mica 8; the upper and lower sheets of the stack being, of course, of insulation, and on the top of the stack, I place another sheet of mica 9 similar to the sheet 8 of somewhat greater area than the stack, so that the edges of the sheets 8 and 9 project a little beyond the sides of the stack. The sheets 6, 7 and 8 with the stack and the sheet of mica 9, overlying it, are disposed against the convex face of the member 1, and then I put on a metallic clamp 10 which binds the member 1, the stack, and the plates 6, 7, 8 and 9 together. This clamp or band has its opposite edges turned over in engagement with the outer or flat face of the member 1, as indicated at 11 in Figure 3. The operation of putting on the clamp causes the stack and the plates 6, 7, 8 and 9 to be bent in accordance with the convex face of the member 1, and the clamp 10 is attached with suflicient pressure to bind the member 1 and the other parts firmly together. On account of the convex face of the member 1, the tension of the clamp 10 will keep the sheets of metallic foil and mica in the stack, in firm engagement with each other over their entire area and maintain uniform compression, between the mica, and the foils in the stack. The condenser can be finished by subjecting it to a vacuum to draw out all of the air and impregnate it with liquid wax to fill any minute voids and interstices.

The opposite ends of the clamp are provided with recesses or notches 12, and the metallic plate 7 has similar and correspondingly located recesses 13. The projecting portions of part of the sheets of metallic foil are indicated at 14 and the projecting portions of the remaining sheets are indicated at 15. These projecting portions are folded down and laid fiat against the projecting ends of the insulating bar 3, and to the ends of this bar 3, I ma attach in any desirable manner, terminal tab s 16 which may contact with the mo projecting foil ends 14 and 15. These terminal tabs enable the condenser to be easily connected into circuit.

The resulting condenser is of very strong construction and the pressure on the stack is even by reason of the convex face of the member 1 and the engagement therewith of the clamp 10. At the same time, the condenser is comparatively inexpensive to make and has practically no liability to become damaged or get out of order.

While only two sheets of foil 5 are shown in Figure 4, for the sake of simplicity and clearness, it is understood that as many as required may be included.

Having described my invention, what I believe to be new and desire to secure and protect by Letters Patent of the United States 1s:-

1. In an electrical condenser, a mounting member having a convex face, insulated conductive elements in proximity to said face, and a clamp for holding said elements and said member together, the ends of said clamp being bent over the sides of said member, and engaging the opposite face thereof.

2. In an electrical condenser, a mounting member having a convex face, plates associated with said face, a stack of insulated electrically conductive elements on said plates, and a clamp for binding said plates, said stack and said member together, said clamp engaging the opposite face of said member.

3. In an electrical condenser, a mounting member having a convex face, a strip of insulation disposed in a groove along said face and projecting beyond the ends of said member, a plurality of plates and a stack of electrically conductive elements insulated from one another disposed upon said face, and a clamp for binding said stack and said plates together, part of said elements projecting at one end and secured to one end of said insulating strip, and the remaining elements projecting from the other end of the stackand secured against the other end of said strip, together with terminals carried by the ends of the strip in engagement with the adjacent elements, the opposite edges of the clamp being bent over the opposite sides of the member to grip the same, and the ends of said clamp, and one of said plates being recessed.

4. An electrical condenser comprising a mounting member having a curved surface, a condenser stack adjacent the curved surface, a clamp having its surface adjacent the stack conform to the said curved surface and engaging the mounting member for maintaining pressure on the stack, the clamp and mounting member together forming the casing of the condenser.

In testimony whereof I afiix my signature.

LUDWIG EDENBURG, 

